linux-kernel - Re: [PATCH] ath10k: spectral: Simplify error checking

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Message-ID: <87fuannse6.fsf@kamboji.qca.qualcomm.com>
Date:   Fri, 13 Oct 2017 12:28:50 +0000
From:   Kalle Valo <kvalo@....qualcomm.com>
To:     Christos Gkekas <chris.gekas@...il.com>
CC:     "ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ath10k: spectral: Simplify error checking

Christos Gkekas <chris.gekas@...il.com> writes:

> Variable val is unsigned so checking whether it is less than zero is
> redundant.
>
> Signed-off-by: Christos Gkekas <chris.gekas@...il.com>
> ---
>  drivers/net/wireless/ath/ath10k/spectral.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath10k/spectral.c b/drivers/net/wireless/ath/ath10k/spectral.c
> index dd9cc09..1867937 100644
> --- a/drivers/net/wireless/ath/ath10k/spectral.c
> +++ b/drivers/net/wireless/ath/ath10k/spectral.c
> @@ -403,10 +403,7 @@ static ssize_t write_file_spectral_count(struct file *file,
>  		return -EFAULT;
>  
>  	buf[len] = '\0';
> -	if (kstrtoul(buf, 0, &val))
> -		return -EINVAL;
> -
> -	if (val < 0 || val > 255)
> +	if (kstrtoul(buf, 0, &val) || val > 255)
>  		return -EINVAL;

Removing the check for negative is correct but I don't think you are
simplifying anything, on the contrary it's harder to read. Please keep
the two if statements separate.

-- 
Kalle Valo